"We are fighting hard to try and keep the people and have made good offers," Martin told BBC Radio Berkshire.

"But there are always going to be clubs who pay more."

He continued: "There is no secret that there are four or five clubs now who are more financially robust or certainly richer in terms of their buying power then the rest of the clubs and we are not in that group."

It's a horrible word (relegation) but it is something that is there and it is something we have to be mindful of

Andy Martin

Joseph, Corbisiero, Garvey and Gibson have been linked with Bath, Northampton, Harlequins and Leicester respectively but have all been offered new contracts by the Exiles.